US9273741B1 - Composite disc brake backing plate - Google Patents
Composite disc brake backing plate Download PDFInfo
- Publication number
- US9273741B1 US9273741B1 US14/534,653 US201414534653A US9273741B1 US 9273741 B1 US9273741 B1 US 9273741B1 US 201414534653 A US201414534653 A US 201414534653A US 9273741 B1 US9273741 B1 US 9273741B1
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- US
- United States
- Prior art keywords
- backing plate
- sheet metal
- brake backing
- core
- stamping
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/002—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of porous nature
- B22F7/004—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of porous nature comprising at least one non-porous part
- B22F7/006—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of porous nature comprising at least one non-porous part the porous part being obtained by foaming
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/02—Braking members; Mounting thereof
- F16D65/04—Bands, shoes or pads; Pivots or supporting members therefor
- F16D65/092—Bands, shoes or pads; Pivots or supporting members therefor for axially-engaging brakes, e.g. disc brakes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/02—Braking members; Mounting thereof
- F16D65/04—Bands, shoes or pads; Pivots or supporting members therefor
- F16D65/092—Bands, shoes or pads; Pivots or supporting members therefor for axially-engaging brakes, e.g. disc brakes
- F16D65/095—Pivots or supporting members therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/04—Attachment of linings
- F16D2069/0425—Attachment methods or devices
- F16D2069/0441—Mechanical interlocking, e.g. roughened lining carrier, mating profiles on friction material and lining carrier
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/04—Attachment of linings
- F16D2069/0425—Attachment methods or devices
- F16D2069/0491—Tools, machines, processes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/0006—Noise or vibration control
Definitions
- the invention relates to disc brake pads and more specifically to metallic backing plates to which wearable friction material is attached.
- Modern vehicle brake systems allow for slowing or stopping movement of the vehicle in a controlled manner.
- a typical automobile or light truck brake system includes a disc brake assembly.
- the brake assemblies are actuated by hydraulic or pneumatic pressure generated when an operator of the vehicle depresses a brake pedal.
- Each brake pad is made up of a relatively thick, substantially planar metallic body, or “backing plate”, to which is attached a friction material or pad of a moulded composite material. Adhesives, rivets, and integral moulding into holes or other retention features in or on the backing plate may be used to secure the friction material to the plate.
- Backing plates for brake pads are typically made of a single piece of solid steel.
- the backing plate distributes the forces across the friction pad. It has been believed that a single-piece backing plate is necessary to provide the strength and rigidity required. However, such plates are relatively heavy especially for large and/or fast vehicles. This has been a recognized problem in the art. There have been attempts to address the weight issue by making a slightly thinner backing plate that is “thickened” in local areas (typically edge perimeter) by embossing. However, the resulting plates are still quite heavy.
- the present invention provides a composite brake backing plate made from first and second sheet metal stampings and a relatively soft metal core.
- Each metal stamping has a textured face with a multiple integrally formed piercing members, each piercing member extending from the face of one of the metal stampings to a distal end.
- the metal core is sandwiched or laminated between the first sheet metal stamping and the second sheet metal stamping.
- the metal core is sufficiently soft and the sheet metal is sufficiently hard that, under pressure, the piercing members formed from the sheet metal are able to penetrate into the metal core.
- the textured face of the first stamping is rolled or pressed into the first face of the metal core so that the piercing members penetrate into the metal core.
- the textured face of the second stamping is rolled or pressed into the second face of the metal core so that the piercing members penetrate into the metal core. This locks the first sheet metal stamping, the second sheet metal stamping and the metal core together.
- the piercing members may alternately be referred to as integrally raised barbs.
- no adhesive or other bonding material is used in forming the brake backing plate.
- Each piercing member on each sheet metal stamping preferably extends substantially perpendicularly from the face of the sheet metal stamping and is tapered so the piercing member has a thickness that decreases from the face of the metal stamping to the distal end of the piercing member.
- the relatively soft metal core is bound to the first and second sheet metal stampings by a locking taper fit of the piercing members and the metal core.
- first sheet metal stamping and the second sheet metal stamping may be made from steel.
- the metal core is preferably made from solid aluminum, which may have a hardness of no more than 70 HB and the steel first and second steel stampings may have a hardness of at least 90 HB.
- the aluminum used to form the core preferably has a hardness of no more than 60 HB and the steel first and second steel stampings preferably have a hardness of at least 100 HB.
- the first sheet metal stamping and the second sheet metal stamping may be made from steel with a thickness of at least 0.8 mm, and the metal core may have a thickness of at least 2.5 mm.
- the first sheet metal stamping may have a second textured face with a plurality of integrally formed retention members extending from the face for attaching to a friction material to form a brake pad.
- the piercing members are preferably formed without piercing through or perforating the stampings.
- the invention further provides methods of making brake backing plates as described above from first and second sheet metal stampings and providing a relatively soft metal core.
- Each metal stamping has the same profile and each has a textured face with a multiple integrally formed piercing members. Each piercing member extends from the face of one of the sheet metal stampings to a distal end.
- the metal core has the same profile as the metal stampings and has two faces. The first metal stamping is pressed or rolled onto the first face of the metal core causing the barbs on the textured face of the first metal stamping pierce the first face of the metal core, thereby locking the first sheet metal stamping and the metal core together. Similarly the second metal stamping is pressed or rolled onto the second face of the metal core causing the barbs on the textured face of the second metal stamping pierce the second face of the metal core, thereby locking the second sheet metal stamping and the metal core together.
- FIG. 1 is a cross section side view through one row of pointed barbs on a textured metal stamping, also showing the shallow groove that the texture tooling cuts to raise each barb.
- FIG. 1 a is an end view of the textured metal stamping of FIG. 1 showing eight rows of pointed barbs.
- FIG. 2 is a cross section side view of a metal stamping textured on both faces through one row of pointed barbs on the lower face and hooked retention barbs on the upper face.
- FIG. 3 shows a typical disc brake backing plate with a rotor-facing textured face of raised barbs.
- FIG. 4 is a cross section side view of a portion of the backing plate of FIG. 3 through the line 4 - 4 in FIG. 3 where the backing plate is seen to be a three layer sandwich where the upper stamping has hooked retention barbs on top and piercing barbs on its lower face piercing the upper face of the core layer, and the lower stamping has piercing barbs piercing the lower face of the core layer.
- a composite brake backing plate is provided.
- a relatively soft lightweight metal core is sandwiched or laminated between harder, first and second metal stampings.
- the core material is made from solid aluminum and the first and second metal stampings are steel.
- the stampings and the core each have substantially the same profile, the profile being the shape and dimensions seen in a plan view like that shown in FIG. 3 so that the stampings and the core can be aligned to form a brake backing plate having that same profile.
- the thicknesses of the three portions (in the direction perpendicular to that shown in FIG. 3 ) generally vary, as discussed below.
- One face of the first and second stampings is textured with a plurality of integrally raised piercing barbs (or piercing members), which are preferably relatively straight, extending perpendicularly from the face to a distal end away from the face, tapered and stocky so that the tips and shank of each barb have the strength to pierce the metal core without deforming by bending hooking or blunting.
- Such tapered piercing barbs preferably have a pointed profile.
- the other face of a stamping may be textured with barbs having a curved/hooked profile for retention of flowable material, and in a variety of sizes and densities.
- Barb-textured metal is available from Nucap Industries of Toronto Ontario, Canada.
- the barbs are piercing barbs that are tapered and pointed so that by rolling or pressing the three layer sandwich, the barbs pierce their way into opposite faces of the core thereby locking the three layers together into a permanent, solid backing plate, without the use of any adhesive or other bonding material.
- the tapering of the barbs results in a strong locking taper fit between the layers.
- the perfect taper fit of the tapered piercing member and core material as the two are driven together results in enormous frictional forces and corresponding resistance to withdrawal of the tapered piercing members that lock the materials together.
- One or both of the metal stampings may also have a second face textured with a plurality of integrally raised retention barbs for attaching suitable materials. On the upper face of the first stamping there may be retention barbs over which brake friction material is moulded.
- the integrally raised barbs are formed on the surface without piercing or perforating through the stamping.
- the stampings may have the required dimensions for a finished brake backing plate shape prior to assembly, or be trimmed after assembly.
- raised tapered barbs 2 , 3 extend from the stampings 1 , 1 a .
- Piercing barbs 3 and retention barbs 2 can be on opposite faces of the same stamping.
- Piercing barbs are preferably tapered, stocky, relatively straight and substantially perpendicular to the face from which they extend.
- the texturizing tooling that raises the barbs plows rows of stop-grooves with toothed blades, and so the barbs are in parallel rows.
- FIG. 1 shows the barb-to-barb spacing within a row of barbs
- FIG. 1 a shows the row spacing.
- a stamping 1 a with barbs on both faces may be used as the friction-receiving side of the backing plate.
- a stamping with barbs on only one face is designated 1 .
- lower stamping 1 b has piercing barbs on the core-facing face.
- FIG. 3 provides a top view of the rotor-facing side of a typical disc brake backing plate, which includes holes B, a typical feature of a backing plate into which friction material flows and hardens to solidify and help retain friction material on the surface of the plate.
- Section 4 - 4 is shown in FIG. 4 where the three-layer sandwich of upper and lower stampings 1 , 1 a and a core 4 is shown in cross section.
- Upper hard stamping 1 a has hooked retention barbs 2 on the upper (or outer) face while its lower (inner) face has piercing barbs 3 that are shown engaged in the surface of softer core layer 4 , as are the piercing barbs 3 on the lower hard stamping 1 b.
- backing plate 7 does not have to have the depicted outwardly facing barbs.
- the friction material may be bonded and/or riveted to a plain face surface.
- barb describes any type of nail-like or pin-like structure, or hooked structure, raised from the surface of a material by carving, gouging or scraping its surface, such as is described in Canadian patent numbers 1,330,521, 1,337,622, and 2,127,339 which are incorporated herein by reference.
- the composite backing plate formed by the present method is an extremely stiff, rigid laminate. This is because, when such a barbed material is bent, for example into a convex or arched shape, the free-standing tips of the raised barbs would naturally have to spread apart or fan-out across the curve. However when the barbs are embedded in the core, the tips are also locked or fixed therein and prevented from spreading. The result is a unique situation where each barb contributes to the overall stiffness of the composite plate. In this way, an exceptionally stiff laminate is created from what would otherwise be relatively flexible sheets of metal (due to their relative thinness).
- metals e.g. stainless steel, regular steel, aluminum
- cheaper or lower grade metals that might not ordinarily be considered for backing plate use.
- the present invention does not employ any adhesive or other bonding material to bond the hard stampings to the core. Rather it relies entirely on the ability of piecing barbs on the inner faces of the hard stampings to pierce the core and create a taper fit. It has been found that tapered piercing barbs raised on steel stampings can penetrate an aluminum core and thereby bond the steel and aluminum tightly together.
- an aluminum core is sandwiched between a piston facing steel sheet textured on one face, and a rotor facing steel sheet textured on both faces.
- the aluminum core may be about 3.2-4.8 mm (0.125-0.1875 inches) thick with an H32 temper (strain-hardened and stabilized, quarter-hard) and a Brinell hardness of about 60 HB. This may be formed from a standard 5052-H32 aluminum sheet for example. Then the steel sheets may be, for example, 1010-full hard or J1392, with a Brinell hardness of about 105 HB.
- the thickness of the rotor/caliper-facing steel sheet to which friction material is attached may be about 1.0-1.5 mm (0.04-0.06 inches), and the thickness of the piston-facing sheet about 1.5-1.9 mm (0.06-0.07 inches).
- the barbs may have a density of about 7-8 barbs per square centimeter (about 48 per square inch), with a height of about 1.5-1.8 mm (0.06-0.07 inches).
- the composite backing plate is about 32% lighter than a standard solid steel backing plate for the same vehicle part number.
- the following table shows the results of a deflection test of an instance of a composite aluminum and steel laminated material as described above compared to the same size bar of soft aluminum.
- the loads were progressively increased from Load 1 to Load 3 and demonstrate the remarkably lower deflection of the composite bar compared to the aluminum bar.
- the aluminum bar bent/deflected beyond the test set-up travel limit of about 10 mm (0.400′′).
- the sandwich may be rolled or pressed to achieve full embedding of the piercing members in the core material.
- every piercing barb on the inner face of each of the stampings 1 , 1 a pierces and extends into the core.
- Application of heat may also be useful or necessary in certain circumstances.
- the rolling or pressing may be done using methods to avoid breaking or crushing the piercing members on the outer surfaces of the stampings, such as by using a grooved roller to follow tracks between rows of piercing members, or, a press plate having a knurled surface.
- each tapered piercing barb have a thickness at its base of about 0.8 mm to 1.3 mm for steel with a Brinell hardness of at least 90 BH, and preferably 100-110 BH or greater.
- the density of the piercing barbs is preferably about 4.7 to 11.6 per square cm (30-75 per square inch), although may also be higher or lower in some embodiments.
- the tapering of the barbs is preferably smooth to facilitate penetration of the core so that the thickness of the barbs near the top of each barb is substantially less than the thickness at the base where the barb extends from the face of the steel stamping.
- the thickness of the barbs proximate to their tips may be 50% or less of the thickness of the barbs at the bases.
- the sandwiches shown and described have two outer layers, it will be appreciated that multi-layer sandwiches are also possible by having more than one core layer and the corresponding number hard stampings (not shown).
- a five-layer backing plate would have two hard outer stampings, each having piercing barbs on their inner face, and an inner stamping having piercing barbs on both faces, with two core layers, each core layer being between the inner stamping and the textured face of one of the outer stampings.
- the abbreviation mm as used herein refers to millimeters (or in the US, “millimeters”).
- the abbreviation cm as used herein refers to centimeters (or in the US, “centimeters”).
Abstract
Description
Overall | Core | Overall | ||
thickness | Steel thickness | thickness | weight | |
Standard steel | 0.220″ | 0.220″ (5.6 mm) | N/A | 0.417 pounds |
backing plate | (5.6 mm) | (0.917 kg) | ||
Composite | 0.220″ | 0.040″ (1 mm) and | 0.125″ | 0.284 pounds |
backing plate | (5.6 mm) | 0.060″ (1.5 mm) | (3.17 mm) | (0.625 kg). |
Load 1 | |
Load 3 | |
Test piece | Deflection | Deflection | Deflection |
Composite bar | 0.013″ (0.33 mm) | 0.040″ (1 mm) | 0.100″ (2.5 mm) |
Aluminum bar | 0.025″ (0.6 mm) | 0.120″ (3 mm) | Elastic limit exceeded |
Claims (15)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/863,923 US9689450B2 (en) | 2014-09-26 | 2015-09-24 | Composite disc brake backing plate |
US15/484,959 US10088004B2 (en) | 2014-09-26 | 2017-04-11 | Composite disc brake backing plate |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2865384 | 2014-09-26 | ||
CA2865384A CA2865384A1 (en) | 2014-09-26 | 2014-09-26 | Composite disc brake backing plate |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/863,923 Continuation-In-Part US9689450B2 (en) | 2014-09-26 | 2015-09-24 | Composite disc brake backing plate |
Publications (1)
Publication Number | Publication Date |
---|---|
US9273741B1 true US9273741B1 (en) | 2016-03-01 |
Family
ID=54256518
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/534,653 Active US9273741B1 (en) | 2014-09-26 | 2014-11-06 | Composite disc brake backing plate |
Country Status (8)
Country | Link |
---|---|
US (1) | US9273741B1 (en) |
EP (1) | EP3001064A1 (en) |
JP (1) | JP2016070497A (en) |
CN (1) | CN105465252A (en) |
BR (1) | BR102015024590A2 (en) |
CA (2) | CA2865384A1 (en) |
RU (1) | RU2015140907A (en) |
TW (1) | TW201625860A (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160091042A1 (en) * | 2014-09-26 | 2016-03-31 | Ray Arbesman | Composite disc brake backing plate |
US9670976B2 (en) | 2012-12-07 | 2017-06-06 | R.A. Investment Management S.A.R.L. | Composite disc brake backing plate |
US9707733B2 (en) | 2012-06-18 | 2017-07-18 | R.A. Investment Management S.A.R.L. | Process for making a laminated sheet |
US9856938B2 (en) | 2014-09-26 | 2018-01-02 | R.A. Investment Management S.A.R.L. | Material with variable height barbs |
US9950495B2 (en) | 2014-07-24 | 2018-04-24 | Nugripmetal S.A.R.L. | System and method for additive manufacturing of a three-dimensional object |
US10010923B1 (en) | 2017-09-13 | 2018-07-03 | Nugripmetal S.A.R.L. | Textured sheet metal |
US10315382B2 (en) | 2016-12-22 | 2019-06-11 | Gripmetal Limited | Process for manufacturing textured laminate sheet |
US11059267B2 (en) | 2013-07-26 | 2021-07-13 | Gripmetal Limited | Metal and graphite laminate |
US11536335B2 (en) | 2018-04-06 | 2022-12-27 | Federal-Mogul Motorparts Llc | Brake pad backing plate |
US11858025B2 (en) | 2012-05-29 | 2024-01-02 | Gripmetal Limited | Bulk textured material sheeting |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108708924A (en) * | 2018-04-17 | 2018-10-26 | 珠海全备汽车零部件有限公司 | A kind of processing method that holding system is mutually embraced in the steel back interlocking of disc brake pad |
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Also Published As
Publication number | Publication date |
---|---|
CA2905922C (en) | 2022-12-13 |
CA2865384A1 (en) | 2016-03-26 |
CA2905922A1 (en) | 2016-03-26 |
EP3001064A1 (en) | 2016-03-30 |
JP2016070497A (en) | 2016-05-09 |
BR102015024590A2 (en) | 2016-09-20 |
TW201625860A (en) | 2016-07-16 |
CN105465252A (en) | 2016-04-06 |
RU2015140907A (en) | 2017-03-30 |
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